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Section 780.21 (b) Continued. <br />Monitoring and sampling of the surface water stations shown on Map 23-2, Water <br />Monitoring Sites contained in Exhibit 42, Drainage and Sediment Control Plan, Map <br />16a, Kerr Mine Area Surface Watex Hydrology; Map 17a, Kerr Tipple Area Hydrology <br />have been conducted in accordance with the permit. <br />Surface water monitoring sites are divided into three categories: Surface <br />Discharge Points; Selected Surface Stations; and Sample Sites. Surface discharge <br />points include all sediment pond discharges and the irrigation ditch adjacent to <br />the Loadout. Selected surface stations monitor inflow to and outflow from the <br />Kerr Mine Area along ephemeral drainages and also include one pit water site. <br />Sample sites include surface water sample locations adjacent to the Loadout. <br />All surface water sites are monitored weekly during March through June and <br />monthly during July through October. Samples are collected at each site during <br />each site visit when water is present and analyzed for the constituents shown on <br />Table 61, Kerr Mine Area Hydrologic Monitoring Schedule. At the time samples are <br />collected, pH, electrical conductivity, and temperature are measured and recorded <br />as field parameters. <br />Flow is measured or estimated at Surface Discharge Points (except at the pit <br />water site) according to the Colorado Discharge Permit System (CDPS). V-notch <br />wires, Cipoletti wiers, H-flumes or other approved measuring devices are used to <br />measure flow at surface discharge points and some selected surface stations. <br />Where no measuring devices are present, flow is estimated. The typical <br />construction of V-notch and Cipoletti wiees is illustrated by Figure 21, Kerr <br />Monitor Wier Design. Sedimentation ponds are monitored for sediment level and <br />water level on a quarterly basis except during winter. Each sedimentation pond <br />has a staff gauge installed for monitoring of water and sediment levels. <br />Following mining, pit backfilling and regarding and revegetation of the majority <br />of the disturbed areas, Kerr proposed in TR-19 to reduce the number of sites to <br />be monitored. The sites eliminated in TR-19 included sites 300, 306, 314, 316, <br />317, 318, 322 and 327. All of the historic monitoring sites are shown on Map 23- <br />2, Water Monitoring Sites contained in Exhibit 42, Drainage and Sediment Control <br />Plan. <br />TR-23 780-109 Revised June 2007 <br />